1211220111101 has 16 divisors (see below), whose sum is σ = 1626253577088. Its totient is φ = 871207272000.

The previous prime is 1211220111061. The next prime is 1211220111113. The reversal of 1211220111101 is 1011110221121.

It is a de Polignac number, because none of the positive numbers 2^k-1211220111101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211220111131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 605004050 + ... + 605006051.

It is an arithmetic number, because the mean of its divisors is an integer number (101640848568).

Almost surely, 2^{1211220111101} is an apocalyptic number.

1211220111101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211220111101 is a deficient number, since it is larger than the sum of its proper divisors (415033465987).

1211220111101 is a wasteful number, since it uses less digits than its factorization.

1211220111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210010132.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1211220111101 its reverse (1011110221121), we get a palindrome (2222330332222).

The spelling of 1211220111101 in words is "one trillion, two hundred eleven billion, two hundred twenty million, one hundred eleven thousand, one hundred one".